More Capacity Per Delivery: Extra large USPS T4 interior accommodates bulk mail, magazines, and small parcels, flag included Keep Deliveries Protected: Magnetic door helps seal out rain and keeps contents secure between pickups Stands Up To Any Weather: Durable plastic resists rain, sleet, snow, and sun, and stays steady on windy days Install In Minutes: Slides over a 4 x 4 wooden post and includes mailbox post cover and mounting hardware; assembled size 63.9" H x 16.86" W x 29.5" D Look New For Years: Molded in color will not chip, fade, crack, or peel, and requires no painting, sanding, or staining